recommend a library/API to unzip file in C# [closed]

Answer 1

SevenZipSharp is a wrapper around tha 7z.dll and LZMA SDK, which is Open-source, and free.

SevenZipCompressor compressor = new SevenZipCompressor(); 
compressor.CompressionLevel = CompressionLevel.Ultra;
compressor.CompressionMethod = CompressionMethod.Lzma;
compressor.CompressionMode = CompressionMode.Create;
compressor.CompressFiles(...);